1. what is the value of z in the equation 5z β 9 = 36? (4 points) 4 5 6 9 2. what is the value of z in the equation 5(2z + 4) = 0? (4 points) -2 0 2 20 3. what is the value of a in the equation 4a + 3(a + 1) = 24? (4 points) 2 3 7 21 4. an equation is shown below: 3(4x + 5) = 12 which of the following correctly shows the beginning steps to solve this equation? (4 points) step 1: 12x + 15 = 12 step 2: 12x = β3 step 1: 12x + 5 = 12 step 2: 12x = 7 step 1: 7x + 5 = 12 step 2: 7x = 7 step 1: 7x + 8 = 12 step 2: 7x = 4 5. how many solutions can be found for the equation 4x β 8 β 4x = 9? (4 points) zero one two infinitely many
How many liters of peroxide should be added to 12 liters of an 8% peroxide solution so that the resulting solution contains 16% peroxide? original added new amount of peroxide 0.96 liters x 0.96 + x amount of solution 12 liters x 12 + x 0.18 liter 1.14 liters 1.92 liters 2.10 liters